/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;

public class ElemIntFormula extends AbstractFormula implements Formula {

    /**
     * index of left in child list
     */
    private static final int LEFT_INDEX = 0;

    /**
     * index of right in child list
     */
    private static final int RIGHT_INDEX = 2;

    /**
     * index of op in child list
     */
    private static final int OP_INDEX = 1;

    public ElemIntFormula(Location location_, IntExpr left_, IntCompOp op_, IntExpr right_) {
        super(location_, left_, op_, right_);
    }


    public ElemIntFormula(IntExpr left_, IntCompOp op_, IntExpr right_) {
        super(Location.UNKNOWN, left_, op_, right_);
    }



    //GET AND SET METHODS

    /**
     * gets the left of this
     * @return the {@link IntExpr}
     */
    public IntExpr getLeft() {
        return (IntExpr)childAt(LEFT_INDEX);
    }

    /** set the Left of this */
    public void setLeft(IntExpr newChild_) {
        setChild(LEFT_INDEX, newChild_);
    }

    /**
     * gets the right of this
     * @return the {@link IntExpr}
     */
    public IntExpr getRight() {
        return (IntExpr)childAt(RIGHT_INDEX);
    }

    /** set the Right of this */
    public void setRight(IntExpr newChild_) {
        setChild(RIGHT_INDEX, newChild_);
    }

    /**
     * gets the op of this
     * @return the {@link IntCompOp}
     */
    public IntCompOp getOp() {
        return (IntCompOp)childAt(OP_INDEX);
    }

    /** set the Op of this */
    public void setOp(IntCompOp newChild_) {
        setChild(OP_INDEX, newChild_);
    }

    /**
     * accept an AST visitor
     * @param visitor_ the visitor
     */
    protected void acceptVisitor(ASTVisitor visitor_) {
        visitor_.visit(this);
    }

    /**
     * accept a returning AST visitor
     * @param visitor_ the visitor
     * @return the Object returned by the visitor
     */
    protected Object acceptReturnVisitor(ASTReturnVisitor visitor_) {
        return visitor_.visit(this);
    }

    public String toString()
    {
        return nodeString();
    }

}
